Sadly, the spammers have got a lot more clever in the last 6 months or so, and email reliability has fallen to a very low level.
A business that relies on email, and which exposes its email address on a website without taking some precautions, has to do some rather proactive measures otherwise they will get 1000 spams a day.
On top of that, most businesses rarely check their emails and, if they ever did, all it takes is for the person in charge of it to leave and they just forget about it. Aviation is a particularly backward business in this respect.
If a school doesn't take calls, that doesn't look good for general contact regarding whether a lesson you've booked is still on (weather, etc).
Avoid, IMHO. Life's too short.